How to measure your ring size: To determine your ring size, we recommend measuring the size of your finger rather than the size of your ring. 1. Use a piece of string or ribbon and wrap it around the base of your finger. To ensure the ring fits snugly we also recommend measuring your joints. We recommend choosing a size that allows you to slide the ring on and off your finger easily. 2. Use a pen to mark the intersection of the two ends of the string. 3. Use a ruler to measure the rope in millimeters. 4. Select the measurement closest to the image below to determine your ring size.